ג כָּל מָקוֹם שֶׁהַיָּחִיד חוֹזֵר וּמִתְפַּלֵּל, שְׁלִיחַ צִבּוּר חוֹזֵר וּמִתְפַּלֵּל, אִם טָעָה כְּמוֹתוֹ כְּשֶׁמִּתְפַּלֵּל בְּקוֹל רָם, חוּץ מִשַּׁחֲרִית שֶׁל רֹאשׁ חֹדֶשׁ, שֶׁאִם שָׁכַח שְׁלִיחַ צִבּוּר וְלֹא הִזְכִּיר יַעֲלֶה וְיָבֹא עַד שֶׁהִשְׁלִים תְּפִלָּתוֹ, אֵין מַחֲזִירִין אוֹתוֹ, מִפְּנֵי טֹרַח הַצִּבּוּר, שֶׁהֲרֵי תְּפִלַּת הַמּוּסָפִין לְפָנָיו שֶׁהוּא מַזְכִּיר בָּהּ רֹאשׁ חֹדֶשׁ; אֲבָל אִם נִזְכַּר קֹדֶם שֶׁהִשְׁלִים תְּפִלָּתוֹ, חוֹזֵר לִרְצֵה וְאֵין בָּזֶה טֹרַח צִבּוּר. הַגָּה: יֵשׁ אוֹמְרִים דְּאִם טָעָה בְּשַׁחֲרִית שֶׁל שַׁבָּת וְיוֹם טוֹב, דִּינוֹ כְּמוֹ בְּרֹאשׁ חֹדֶשׁ, וְהָכֵי נָהוּג (טוּר וּסְמַ"ק).
3 In any case in which an individual goes back and prays [the individual Amidah again due to a mistake], [so too] a prayer leader goes back and prays [again] if [the prayer leader] erred in like manner when praying [the Amidah] aloud - except for Shacharit of Rosh Chodesh - since if the prayer leader forgot and did not realize [and recite] Ya-aleh V'yavo before [the leader] finished [the leader's] prayer [i.e. Amidah], We do not require [the leader] to go back [and repeat the Amidah again], because this would be a burden for the congregation since after all, the Musaf prayer is still to come and in which [the prayer leader] mentions Rosh Chodesh. But if it was remembered before [the leader] concluded [the leader's] prayer, [the leader] goes back to [the blessing of] Retzei and it is not considered a burden for the congregation. Rema: There are those who say that if [the leader] made a mistake in Shacharit of Shabbat, or of Yom Tov, the rule is the same as Rosh Chodesh, and this is how we practice (Tur and Sefer Mitzvot Katan])